Ganymede is the largest moon in the Solar System, and is even larger than the planet Mercury.

Io is the most volcanically active body in the Solar System, with over 400 active volcanoes.

Europa is thought to have a subsurface ocean that may be habitable, as it is believed to contain liquid water and organic molecules.

Titan is the only moon in the Solar System with a thick atmosphere, and is often referred to as a "Saturnian moon" due to its similarities to Saturn.

Triton is the largest moon of Neptune, and is the only moon in the Solar System known to have a retrograde orbit.

Titania is the largest moon of Uranus, and is the eighth-largest moon in the Solar System.

Phobos is the largest moon of Mars, and is the closest moon to its planet in the Solar System.

Ganymede is the largest moon of Jupiter, and is the largest moon in the Solar System.

Titan is the largest moon of Saturn, and is the second-largest moon in the Solar System.

Charon is the largest moon of Pluto, and is the only moon in the Solar System that is larger than half the size of its planet.

Dysnomia is the largest moon of Eris, and is the largest known moon of a dwarf planet in the Solar System.

Hi'laka is the largest moon of Haumea, and is the second-largest known moon of a dwarf planet in the Solar System.

S/2015 (136472) 1 is the largest moon of Makemake, and is the third-largest known moon of a dwarf planet in the Solar System.

Xiangliu is the largest moon of Gonggong, and is the fourth-largest known moon of a dwarf planet in the Solar System.

Weywot is the largest moon of Quaoar, and is the fifth-largest known moon of a dwarf planet in the Solar System.